Nerves of the upper limb Prof. Abdulameer Al-Nuaimi. E. mail:
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1 Nerves of the upper limb Prof. Abdulameer Al-Nuaimi E. mail:
2 Brachial plexus
3
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5 Median nerve After originating from the brachial plexus in the axilla, the median nerve descends down the arm, initially lateral to the brachial artery. Halfway down the arm, the nerve crosses over the brachial artery, and becomes situated medially. The median nerve enters the anterior compartment of the forearm between the two heads of pronator teres muscle via the cubital fossa. In the forearm, the nerve travels between the flexor digitorum profundus and flexor digitorum superficialis muscles. Major branches in the forearm: 1- Anterior interosseous nerve supplies the deep muscles in the anterior forearm. 2- Palmar cutaneous nerve innervates the skin of the lateral palm
6 The median nerve enters the hand via the carpal tunnel where it terminates by dividing into two branches: 1- Recurrent branch innervates the thenar muscles. 2- Palmar digital branch innervates the palmar surface and fingertips of the lateral three and half digits. Also innervates the lateral two lumbrical muscles. Recrrent branch Palmar digital branches
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8 Median nerve Sensory functions: Gives rise to the palmar cutaneous branch, which innervates the lateral aspect of the palm, and the digital cutaneous branch, which innervates the lateral three and a half fingers on the anterior (palmar) surface of the hand Nerve roots: C6 T1 (also contains fibres from C5 in some individuals). Motor functions: Innervates the flexor and pronator muscles in the anterior compartment of the forearm (except the flexor carpi ulnaris and part of the flexor digitorum profundus, innervated by the ulnar nerve). Also supplies innervation to the thenar muscles and lateral two lumbricals in the hand.
9 Median cutaneous nerve supply of the hand
10 Sensory functions: Innervates the anterior and posterior surfaces of the medial one and half fingers, and the associated palm area Anatomical Course After arising from the brachial plexus, the ulnar nerve descends down the medial aspect of the upper arm. At the elbow, it passes posterior to the medial epicondyle of the humerus and gives rise to an articular branch to the elbow joint. Ulnar nerve is palpable at the medial epicondyle Ulnar nerve Spinal roots: C8-T1. Motor functions: Innervates the intrinsic muscles of the hand (hypothenar muscles and two medial lumbricals), and two muscles in the forearm; flexor carpi ulnaris and medial half of flexor digitorum profundus.
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12 In the forearm, the ulnar nerve pierces the two heads of the flexor carpi ulnaris, and travels deep to the muscle, alongside the ulna. Three main branches arise in the forearm: 1- Muscular branch innervates two muscles in the anterior compartment of the forearm. 2- Palmar cutaneous branch innervates the medial half of the palm. 3- Dorsal cutaneous branch innervates the dorsal surface of the medial one and a half fingers, and the associated dorsal hand area At the wrist, the ulnar nerve travels superficially to the flexor retinaculum, and is medial to the ulnar artery. It enters the hand via the ulnar canal. In the hand, the nerve terminates by giving rise to superficial and deep branches
13 Palmer cutan branch of Ul N Palmar cutaneous branch Of ulnar nerve
14 Ulnar nerve
15 Motor Functions The ulnar nerve innervates In the anterior compartment of the forearm Flexor carpi ulnaris. Flexor digitorum profundus (medial half) In the hand. The majority of the intrinsic hand muscles are innervated by the deep branch of the ulnar nerve: Hypothenar muscles Medial two lumbricals Adductor pollicis Palmar and dorsal interossei of the hand
16 Radial nerve Anatomical Course: The radial nerve is the terminal continuation of the posterior cord of the brachial plexus. It therefore contains fibres from nerve roots C5 T1. The nerve arises in the axilla region, where it is situated posteriorly to the axillary artery. It exits the axilla inferiorly (via the triangular interval), and supplies branches to the long and lateral heads of the triceps brachii. The radial nerve then descends down the arm, travelling in a shallow depression within the surface of the humerus, known as the radial groove. As it descends, the radial nerve wraps around the humerus laterally, and supplies a branch to the medial head of the triceps brachii. During much of its course within the arm, it is accompanied by the profunda brachii branch of the brachial artery
17 To enter the forearm, the radial nerve travels anterior to the lateral epicondyle of the humerus (Radial nerve has motor and sensory parts).the radial nerve then divides into two branches, superficial and deep branches. The deep branch of the radial nerve winds to the back of the forearm around the lateral side of the radius between the two planes of fibers of the Supinator, and is prolonged downward between the superficial and deep layers of muscles, to the middle of the forearm. The deep branch continues as posterior interosseous nerve provides motor supply to the muscles in the posterior compartment of the forearm, which is mostly the extensor muscles of the hand. The radial nerve also innervates the triceps brachii
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19 Superficial branch (sensory) The superficial branch of the radial nerve passes along the front of the radial side of the forearm. It lies at slightly lateral to the radial artery, beneath the Brachioradialis. It leaves the artery about 7 cm. above the wrist, passes beneath the tendon of the Brachioradialis, and, piercing the deep fascia, divides into two branches: lateral and medial. Innervates most of the skin of the posterior side of forearm, the dorsal surface of the lateral side of the palm, and dorsal surface of the lateral three and a half fingers.
20 Brachioradialis muscle Superficial branch of radial nerve
21 Radial nerve
22 Thank You
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